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Extra info for IEEE Standard for a High Performance Serial Bus
Request) The link layer uses this service to request the PHY layer to start arbitration for the bus. The PHY layer shall arbitrate for the bus using the method specified by the service parameters. The PHY layer shall service the request immediately upon receipt from the link layer. This service shall be confirmed when the arbitration process completes. confirmation with an arbitration request status of LOST), it shall reissue the arbitration request. The following parameters are communicated via this service: a) 48 Arbitration Class.
A valid combination for management purposes is the presence of the isochronous resource manager entity and the absence of the bus manager entity. In this circumstance, the isochronous resources manager exercises a subset of the management resonsibilities normally assumed by the bus manager. Another valid combination is the absence of any bus manager entity, in which case no isochronous traffic is allowed. The bus manager provides the services of a) b) c) d) Advanced bus power management Maintenance of the speed map Maintenance of the topological map Bus optimization based on information obtained from the topological map The isochronous resources manager provides facilities for a) b) c) Allocation of isochronous bandwidth Allocation of channel numbers Selection of the cycle master Within the backplane environment, significantly more elements are determined by the host backplane, so there is a much reduced need for any centralized level of control.
This is needed to allow low-level power management and the building of a system topology map needed to determine the speed capabilities of each data path. 1 discusses this process. The self-ID process uses a deterministic selection process, where the root node passes control of the media to the node attached to its lowest numbered connected port and waits for that node to send an “ident_done” signal, indicating that it and all of its children have identified themselves. The root then passes control to its next highest port and waits for that node to finish.